Effect of metallurgical dust on NO emissions during coal combustion process
Effect of metallurgical dust on NO emissions during coal combustion process作者机构：School of Metallurgy Engineering Anhui Universityof Technology Ma'anshan 243002 Anhui China Key Laboratory of Metallurgical Emission Reductionand Resources Recycling Ministry of Education AnhuiUniversity of Technology Ma'anshan 243002 Anhui China
出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)
年 卷 期：2018年第25卷第1期
页 面：19-27页
核心收录：
学科分类：0202[经济学-应用经济学] 02[经济学] 081702[工学-化学工艺] 020205[经济学-产业经济学] 08[工学] 0817[工学-化学工程与技术]
主 题：Metallurgical dust NO emission Reaction mechanism Coal combustion
摘 要：NO emissions from coal combustion are receiving significant attention in recent years. As a solid waste generated from metallurgical industry, metallurgical dust （MD） contains a large amount of metal oxides, such as Fe2O3, CaO, SiO2 and Al2O3, as well as other rare metal oxides. The influence of MD on the NO emissions and the mechanism of the coal com- bustion systems were analyzed. The results show that the peak values of NO emission decrease with the increase in MD mass percent, and the curve of NO emission can be divided into two stages including rapid generation （400-600 ℃） and slow release （800-900 ℃）. The reduction of NO is significantly affected by temperature, volatile components, 02 and CO. CO has a significant catalytic action which can deoxidize NO to N2. The results obtained by X-ray diffraction and scanning electron microscopy indicate that multiple components in MD, such as FegTiO15, Fe2O3 and TiO2, can react with NO to produce TiN. Besides, the alkali metals in MD, such as Na, K and Ca, may catalyze NO precursor to inhibit NO emission. These results indicate that MD is cheap and highly efficient in controlling NO emissions during coal combustion processes.
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